Hello. I have problem with ef03157 esp8266 module. It has v, rx, tx, g, gpio terminals. V I connected to arduino uno 3.3 volts. G to arduino ground, rx and tx to arduino rx tx terminals. Gpio I connected to ground terminal. When I try to uploud program to microcontroller I get this error: espcomm_mem failed. Could you help me with that ?
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What arduino board do you have selected in the IDE when compiling?